FX614D4

Overview

The FX614D4 is a low-power CMOS integrated circuit designed for Bell 202 compatible modem applications, supporting asynchronous data transmission and reception at 1200 bits/sec. It operates on a supply voltage ranging from 3.0V to 5.5V with an operating current of 1.0mA at 3V. The device features a 'Zero-Power' mode consuming only 1μA. It includes optional back channels at 5 bits/sec or 150 bits/sec, line equalization, and data retiming facilities. The component utilizes a 3.579545MHz crystal clock rate and is housed in a 16-pin SOIC (D4) package.

Feature Summary

• Supports Bell 202 standard modulation with optional lower-speed back channels
• Integrates receive path line equalization controlled by external logic
• Provides hardware data retiming to eliminate UART requirements in microcontrollers
• Features ultra-low power consumption with a dedicated zero-power sleep state

Applications

• Telephone telemetry systems requiring low power operation
• Portable terminal devices powered by limited battery sources
• Line-powered communication equipment

Procurement Notes

Verify the specific D4 suffix confirms the 16-pin SOIC package configuration required for your PCB layout. Confirm that the design accommodates the legacy status of this component, as it may not be recommended for new designs depending on current manufacturer guidelines. Ensure supply chain stability for long-term production needs.

Selection Notes

Select this component when a fully integrated Bell 202 modem solution is needed without external demodulators. It is suitable for designs where minimizing microcontroller software overhead via hardware data retiming is a priority. Verify that the 3.58MHz clock requirement aligns with available system oscillators.

Part Context

The FX prefix indicates the product originated from Consumer Microcircuits Limited before the company adopted the CMX prefix globally. The FX614D4 represents the surface-mount variant of the FX614 family. This part belongs to the legacy communication semiconductor portfolio managed by CML Microsystems Plc.

Replacement Considerations

No direct public substitute part numbers are documented for this specific legacy component. Designers should evaluate the CMX series equivalents if available, though functional pinouts and specifications may differ significantly.